Exfoliated Molybdenum Disulfide-Wrapped CdS Nanoparticles as a Nano-Heterojunction for Photo-Electrochemical Water Splitting

Dolai, S and Maiti, P and Ghorai, A and Bhunia, R and Paul, PK and Ghosh, D (2021) Exfoliated Molybdenum Disulfide-Wrapped CdS Nanoparticles as a Nano-Heterojunction for Photo-Electrochemical Water Splitting. In: ACS Applied Materials and Interfaces, 13 (1). pp. 438-448.

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Abstract

We developed a heterojunction photocathode, MoS2@CdS, based on the wrapping of CdS nanoparticles by the MoS2 nanocrystals. The liquid-phase exfoliation method was adopted for preparing few-layer MoS2 nanocrystals of a layer thickness of μ7.9 nm, whereas CdS nanoparticles of an average diameter of μ17 nm were synthesized by the one-step hydrothermal process. The synthesized nanocrystals and nanoparticles were characterized by AFM, FESEM, HRTEM, STEM, XRD, GIXRD, UV-vis absorption, fluorescence emission, and Raman spectroscopy. The difference between two modes in the Raman spectrum of MoS2 indicates the formation of few-layer MoS2. The photoelectrochemical performance of the heterojunction photocathode was excellent. The MoS2@CdS heterostructure photocathode increased the photocurrent density (JPh) under 100 mW/cm2 illumination. We obtained the maximum applied biased photoconversion efficiency (ABPE) of μ1.2 of the MoS2@CdS heterojunction photocathode in optimum device configuration. The production of H2 was measured as μ72 μmol/h for the MoS2@CdS heterostructure with a cyclic stability of up to 7500 s. © 2020 American Chemical Society.

Item Type:	Journal Article
Publication:	ACS Applied Materials and Interfaces
Publisher:	American Chemical Society
Additional Information:	The copyright for this article belongs to American Chemical Society.
Keywords:	Cadmium sulfide; CdS nanoparticles; Heterojunctions; II-VI semiconductors; Layered semiconductors; Nanocrystals; Photocathodes; Photocurrents; Sulfur compounds; Synthesis (chemical), Device configurations; Fluorescence emission; Heterostructure photocathodes; Hydrothermal process; Nanocrystals and nanoparticles; Photoconversion efficiency; Photocurrent density; Photoelectrochemical performance, Molybdenum compounds
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	20 Feb 2023 11:00
Last Modified:	20 Feb 2023 11:00
URI:	https://eprints.iisc.ac.in/id/eprint/80414

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